Quiet threats

Soft song as an aggressive signal in birds

Çağlar Akçay, Rindy C. Anderson, Stephen Nowicki, Michael D. Beecher, William Searcy

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Theory suggests that aggressive signals must be costly if they are to be reliable. Recent research in birds has shown, however, that in many species the best predictors of impending attack are low-amplitude vocal signals, soft songs or soft calls, that seem cheap to produce and easy to cheat. This observation leads to two related but separate questions: (1) why use low-amplitude signals to communicate aggressiveness and (2) what maintains the reliability of soft signals of aggression? We review potential answers to both questions and present evidence relevant to each. While some hypotheses are logically sound, others have logical flaws, and most of the hypotheses have yet to be critically tested. One exception is the hypothesis that the reliability of soft signals of aggressiveness is maintained by receiver retaliation, which has been supported by experimental evidence in multiple species. We emphasize the need for further research, particularly to answer the question of why soft song is soft, and outline future research directions.

Original languageEnglish (US)
Pages (from-to)267-274
Number of pages8
JournalAnimal Behaviour
Volume105
DOIs
StatePublished - Jul 1 2015

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song
animal communication
aggression
bird
birds

Keywords

  • Aggressive signalling
  • Amplitude
  • Eavesdropping
  • Honesty
  • Quiet song
  • Soft song
  • Song sparrow

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Ecology, Evolution, Behavior and Systematics

Cite this

Quiet threats : Soft song as an aggressive signal in birds. / Akçay, Çağlar; Anderson, Rindy C.; Nowicki, Stephen; Beecher, Michael D.; Searcy, William.

In: Animal Behaviour, Vol. 105, 01.07.2015, p. 267-274.

Research output: Contribution to journalArticle

Akçay, Çağlar ; Anderson, Rindy C. ; Nowicki, Stephen ; Beecher, Michael D. ; Searcy, William. / Quiet threats : Soft song as an aggressive signal in birds. In: Animal Behaviour. 2015 ; Vol. 105. pp. 267-274.
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